[deliverable/linux.git] / drivers / clk / clkdev.c

/*
 * drivers/clk/clkdev.c
 *
 *  Copyright (C) 2008 Russell King.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * Helper for the clk API to assist looking up a struct clk.
 */
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/list.h>
#include <linux/errno.h>
#include <linux/err.h>
#include <linux/string.h>
#include <linux/mutex.h>
#include <linux/clk.h>
#include <linux/clkdev.h>
#include <linux/clk-provider.h>
#include <linux/of.h>

#include "clk.h"

static LIST_HEAD(clocks);
static DEFINE_MUTEX(clocks_mutex);

#if defined(CONFIG_OF) && defined(CONFIG_COMMON_CLK)

static struct clk *__of_clk_get_by_clkspec(struct of_phandle_args *clkspec,
					 const char *dev_id, const char *con_id)
{
	struct clk *clk;

	if (!clkspec)
		return ERR_PTR(-EINVAL);

	of_clk_lock();
	clk = __of_clk_get_from_provider(clkspec, dev_id, con_id);
	of_clk_unlock();
	return clk;
}

/**
 * of_clk_get_by_clkspec() - Lookup a clock form a clock provider
 * @clkspec: pointer to a clock specifier data structure
 *
 * This function looks up a struct clk from the registered list of clock
 * providers, an input is a clock specifier data structure as returned
 * from the of_parse_phandle_with_args() function call.
 */
struct clk *of_clk_get_by_clkspec(struct of_phandle_args *clkspec)
{
	return __of_clk_get_by_clkspec(clkspec, NULL, __func__);
}

static struct clk *__of_clk_get(struct device_node *np, int index,
			       const char *dev_id, const char *con_id)
{
	struct of_phandle_args clkspec;
	struct clk *clk;
	int rc;

	if (index < 0)
		return ERR_PTR(-EINVAL);

	rc = of_parse_phandle_with_args(np, "clocks", "#clock-cells", index,
					&clkspec);
	if (rc)
		return ERR_PTR(rc);

	clk = __of_clk_get_by_clkspec(&clkspec, dev_id, con_id);
	of_node_put(clkspec.np);

	return clk;
}

struct clk *of_clk_get(struct device_node *np, int index)
{
	return __of_clk_get(np, index, np->full_name, NULL);
}
EXPORT_SYMBOL(of_clk_get);

static struct clk *__of_clk_get_by_name(struct device_node *np,
					const char *dev_id,
					const char *name)
{
	struct clk *clk = ERR_PTR(-ENOENT);

	/* Walk up the tree of devices looking for a clock that matches */
	while (np) {
		int index = 0;

		/*
		 * For named clocks, first look up the name in the
		 * "clock-names" property.  If it cannot be found, then
		 * index will be an error code, and of_clk_get() will fail.
		 */
		if (name)
			index = of_property_match_string(np, "clock-names", name);
		clk = __of_clk_get(np, index, dev_id, name);
		if (!IS_ERR(clk)) {
			break;
		} else if (name && index >= 0) {
			if (PTR_ERR(clk) != -EPROBE_DEFER)
				pr_err("ERROR: could not get clock %s:%s(%i)\n",
					np->full_name, name ? name : "", index);
			return clk;
		}

		/*
		 * No matching clock found on this node.  If the parent node
		 * has a "clock-ranges" property, then we can try one of its
		 * clocks.
		 */
		np = np->parent;
		if (np && !of_get_property(np, "clock-ranges", NULL))
			break;
	}

	return clk;
}

/**
 * of_clk_get_by_name() - Parse and lookup a clock referenced by a device node
 * @np: pointer to clock consumer node
 * @name: name of consumer's clock input, or NULL for the first clock reference
 *
 * This function parses the clocks and clock-names properties,
 * and uses them to look up the struct clk from the registered list of clock
 * providers.
 */
struct clk *of_clk_get_by_name(struct device_node *np, const char *name)
{
	if (!np)
		return ERR_PTR(-ENOENT);

	return __of_clk_get_by_name(np, np->full_name, name);
}
EXPORT_SYMBOL(of_clk_get_by_name);

#else /* defined(CONFIG_OF) && defined(CONFIG_COMMON_CLK) */

static struct clk *__of_clk_get_by_name(struct device_node *np,
					const char *dev_id,
					const char *name)
{
	return ERR_PTR(-ENOENT);
}
#endif

/*
 * Find the correct struct clk for the device and connection ID.
 * We do slightly fuzzy matching here:
 *  An entry with a NULL ID is assumed to be a wildcard.
 *  If an entry has a device ID, it must match
 *  If an entry has a connection ID, it must match
 * Then we take the most specific entry - with the following
 * order of precedence: dev+con > dev only > con only.
 */
static struct clk_lookup *clk_find(const char *dev_id, const char *con_id)
{
	struct clk_lookup *p, *cl = NULL;
	int match, best_found = 0, best_possible = 0;

	if (dev_id)
		best_possible += 2;
	if (con_id)
		best_possible += 1;

	list_for_each_entry(p, &clocks, node) {
		match = 0;
		if (p->dev_id) {
			if (!dev_id || strcmp(p->dev_id, dev_id))
				continue;
			match += 2;
		}
		if (p->con_id) {
			if (!con_id || strcmp(p->con_id, con_id))
				continue;
			match += 1;
		}

		if (match > best_found) {
			cl = p;
			if (match != best_possible)
				best_found = match;
			else
				break;
		}
	}
	return cl;
}

struct clk *clk_get_sys(const char *dev_id, const char *con_id)
{
	struct clk_lookup *cl;
	struct clk *clk = NULL;

	mutex_lock(&clocks_mutex);

	cl = clk_find(dev_id, con_id);
	if (!cl)
		goto out;

	clk = __clk_create_clk(__clk_get_hw(cl->clk), dev_id, con_id);
	if (IS_ERR(clk))
		goto out;

	if (!__clk_get(clk)) {
		__clk_free_clk(clk);
		cl = NULL;
		goto out;
	}

out:
	mutex_unlock(&clocks_mutex);

	return cl ? clk : ERR_PTR(-ENOENT);
}
EXPORT_SYMBOL(clk_get_sys);

struct clk *clk_get(struct device *dev, const char *con_id)
{
	const char *dev_id = dev ? dev_name(dev) : NULL;
	struct clk *clk;

	if (dev) {
		clk = __of_clk_get_by_name(dev->of_node, dev_id, con_id);
		if (!IS_ERR(clk) || PTR_ERR(clk) == -EPROBE_DEFER)
			return clk;
	}

	return clk_get_sys(dev_id, con_id);
}
EXPORT_SYMBOL(clk_get);

void clk_put(struct clk *clk)
{
	__clk_put(clk);
}
EXPORT_SYMBOL(clk_put);

void clkdev_add(struct clk_lookup *cl)
{
	mutex_lock(&clocks_mutex);
	list_add_tail(&cl->node, &clocks);
	mutex_unlock(&clocks_mutex);
}
EXPORT_SYMBOL(clkdev_add);

void __init clkdev_add_table(struct clk_lookup *cl, size_t num)
{
	mutex_lock(&clocks_mutex);
	while (num--) {
		list_add_tail(&cl->node, &clocks);
		cl++;
	}
	mutex_unlock(&clocks_mutex);
}

#define MAX_DEV_ID	20
#define MAX_CON_ID	16

struct clk_lookup_alloc {
	struct clk_lookup cl;
	char	dev_id[MAX_DEV_ID];
	char	con_id[MAX_CON_ID];
};

static struct clk_lookup * __init_refok
vclkdev_alloc(struct clk *clk, const char *con_id, const char *dev_fmt,
	va_list ap)
{
	struct clk_lookup_alloc *cla;

	cla = __clkdev_alloc(sizeof(*cla));
	if (!cla)
		return NULL;

	cla->cl.clk = clk;
	if (con_id) {
		strlcpy(cla->con_id, con_id, sizeof(cla->con_id));
		cla->cl.con_id = cla->con_id;
	}

	if (dev_fmt) {
		vscnprintf(cla->dev_id, sizeof(cla->dev_id), dev_fmt, ap);
		cla->cl.dev_id = cla->dev_id;
	}

	return &cla->cl;
}

struct clk_lookup * __init_refok
clkdev_alloc(struct clk *clk, const char *con_id, const char *dev_fmt, ...)
{
	struct clk_lookup *cl;
	va_list ap;

	va_start(ap, dev_fmt);
	cl = vclkdev_alloc(clk, con_id, dev_fmt, ap);
	va_end(ap);

	return cl;
}
EXPORT_SYMBOL(clkdev_alloc);

int clk_add_alias(const char *alias, const char *alias_dev_name, char *id,
	struct device *dev)
{
	struct clk *r = clk_get(dev, id);
	struct clk_lookup *l;

	if (IS_ERR(r))
		return PTR_ERR(r);

	l = clkdev_alloc(r, alias, alias_dev_name);
	clk_put(r);
	if (!l)
		return -ENODEV;
	clkdev_add(l);
	return 0;
}
EXPORT_SYMBOL(clk_add_alias);

/*
 * clkdev_drop - remove a clock dynamically allocated
 */
void clkdev_drop(struct clk_lookup *cl)
{
	mutex_lock(&clocks_mutex);
	list_del(&cl->node);
	mutex_unlock(&clocks_mutex);
	kfree(cl);
}
EXPORT_SYMBOL(clkdev_drop);

/**
 * clk_register_clkdev - register one clock lookup for a struct clk
 * @clk: struct clk to associate with all clk_lookups
 * @con_id: connection ID string on device
 * @dev_id: format string describing device name
 *
 * con_id or dev_id may be NULL as a wildcard, just as in the rest of
 * clkdev.
 *
 * To make things easier for mass registration, we detect error clks
 * from a previous clk_register() call, and return the error code for
 * those.  This is to permit this function to be called immediately
 * after clk_register().
 */
int clk_register_clkdev(struct clk *clk, const char *con_id,
	const char *dev_fmt, ...)
{
	struct clk_lookup *cl;
	va_list ap;

	if (IS_ERR(clk))
		return PTR_ERR(clk);

	va_start(ap, dev_fmt);
	cl = vclkdev_alloc(clk, con_id, dev_fmt, ap);
	va_end(ap);

	if (!cl)
		return -ENOMEM;

	clkdev_add(cl);

	return 0;
}
EXPORT_SYMBOL(clk_register_clkdev);

/**
 * clk_register_clkdevs - register a set of clk_lookup for a struct clk
 * @clk: struct clk to associate with all clk_lookups
 * @cl: array of clk_lookup structures with con_id and dev_id pre-initialized
 * @num: number of clk_lookup structures to register
 *
 * To make things easier for mass registration, we detect error clks
 * from a previous clk_register() call, and return the error code for
 * those.  This is to permit this function to be called immediately
 * after clk_register().
 */
int clk_register_clkdevs(struct clk *clk, struct clk_lookup *cl, size_t num)
{
	unsigned i;

	if (IS_ERR(clk))
		return PTR_ERR(clk);

	for (i = 0; i < num; i++, cl++) {
		cl->clk = clk;
		clkdev_add(cl);
	}

	return 0;
}
EXPORT_SYMBOL(clk_register_clkdevs);
Commit	Line	Data
0318e693	1	/*
6d803ba7	2	* drivers/clk/clkdev.c
0318e693 RK	3	*
	4	* Copyright (C) 2008 Russell King.
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License version 2 as
	8	* published by the Free Software Foundation.
	9	*
	10	* Helper for the clk API to assist looking up a struct clk.
	11	*/
	12	#include <linux/module.h>
	13	#include <linux/kernel.h>
	14	#include <linux/device.h>
	15	#include <linux/list.h>
	16	#include <linux/errno.h>
	17	#include <linux/err.h>
	18	#include <linux/string.h>
	19	#include <linux/mutex.h>
c0c60c4b	20	#include <linux/clk.h>
6d803ba7	21	#include <linux/clkdev.h>
035a61c3	22	#include <linux/clk-provider.h>
766e6a4e	23	#include <linux/of.h>
0318e693	24
3a3d2b05 SN	25	#include "clk.h"
3a3d2b05 SN	26
0318e693 RK	27	static LIST_HEAD(clocks);
	28	static DEFINE_MUTEX(clocks_mutex);
	29
137f8a72	30	#if defined(CONFIG_OF) && defined(CONFIG_COMMON_CLK)
7f05e28f	31
73e0e496 SB	32	static struct clk __of_clk_get_by_clkspec(struct of_phandle_args clkspec,
	33	const char dev_id, const char con_id)
	34	{
	35	struct clk *clk;
	36
	37	if (!clkspec)
	38	return ERR_PTR(-EINVAL);
	39
	40	of_clk_lock();
	41	clk = __of_clk_get_from_provider(clkspec, dev_id, con_id);
	42	of_clk_unlock();
	43	return clk;
	44	}
	45
7f05e28f SN	46	/**
	47	* of_clk_get_by_clkspec() - Lookup a clock form a clock provider
	48	* @clkspec: pointer to a clock specifier data structure
	49	*
	50	* This function looks up a struct clk from the registered list of clock
	51	* providers, an input is a clock specifier data structure as returned
	52	* from the of_parse_phandle_with_args() function call.
	53	*/
	54	struct clk of_clk_get_by_clkspec(struct of_phandle_args clkspec)
	55	{
73e0e496	56	return __of_clk_get_by_clkspec(clkspec, NULL, __func__);
7f05e28f SN	57	}
7f05e28f SN	58
73e0e496 SB	59	static struct clk __of_clk_get(struct device_node np, int index,
73e0e496 SB	60	const char dev_id, const char con_id)
766e6a4e GL	61	{
	62	struct of_phandle_args clkspec;
	63	struct clk *clk;
	64	int rc;
	65
	66	if (index < 0)
	67	return ERR_PTR(-EINVAL);
	68
	69	rc = of_parse_phandle_with_args(np, "clocks", "#clock-cells", index,
	70	&clkspec);
	71	if (rc)
	72	return ERR_PTR(rc);
	73
73e0e496	74	clk = __of_clk_get_by_clkspec(&clkspec, dev_id, con_id);
766e6a4e	75	of_node_put(clkspec.np);
035a61c3 TV	76
	77	return clk;
	78	}
	79
	80	struct clk of_clk_get(struct device_node np, int index)
	81	{
73e0e496	82	return __of_clk_get(np, index, np->full_name, NULL);
766e6a4e GL	83	}
	84	EXPORT_SYMBOL(of_clk_get);
	85
035a61c3 TV	86	static struct clk __of_clk_get_by_name(struct device_node np,
	87	const char *dev_id,
	88	const char *name)
766e6a4e GL	89	{
	90	struct clk *clk = ERR_PTR(-ENOENT);
	91
	92	/* Walk up the tree of devices looking for a clock that matches */
	93	while (np) {
	94	int index = 0;
	95
	96	/*
	97	* For named clocks, first look up the name in the
	98	* "clock-names" property. If it cannot be found, then
	99	* index will be an error code, and of_clk_get() will fail.
	100	*/
	101	if (name)
	102	index = of_property_match_string(np, "clock-names", name);
73e0e496	103	clk = __of_clk_get(np, index, dev_id, name);
035a61c3	104	if (!IS_ERR(clk)) {
766e6a4e	105	break;
73e0e496	106	} else if (name && index >= 0) {
d8e53c3d SB	107	if (PTR_ERR(clk) != -EPROBE_DEFER)
	108	pr_err("ERROR: could not get clock %s:%s(%i)\n",
	109	np->full_name, name ? name : "", index);
766e6a4e GL	110	return clk;
	111	}
	112
	113	/*
	114	* No matching clock found on this node. If the parent node
	115	* has a "clock-ranges" property, then we can try one of its
	116	* clocks.
	117	*/
	118	np = np->parent;
	119	if (np && !of_get_property(np, "clock-ranges", NULL))
	120	break;
	121	}
	122
	123	return clk;
	124	}
035a61c3 TV	125
	126	/**
	127	* of_clk_get_by_name() - Parse and lookup a clock referenced by a device node
	128	* @np: pointer to clock consumer node
	129	* @name: name of consumer's clock input, or NULL for the first clock reference
	130	*
	131	* This function parses the clocks and clock-names properties,
	132	* and uses them to look up the struct clk from the registered list of clock
	133	* providers.
	134	*/
	135	struct clk of_clk_get_by_name(struct device_node np, const char *name)
	136	{
	137	if (!np)
	138	return ERR_PTR(-ENOENT);
	139
	140	return __of_clk_get_by_name(np, np->full_name, name);
	141	}
766e6a4e	142	EXPORT_SYMBOL(of_clk_get_by_name);
035a61c3 TV	143
	144	#else /* defined(CONFIG_OF) && defined(CONFIG_COMMON_CLK) */
	145
	146	static struct clk __of_clk_get_by_name(struct device_node np,
	147	const char *dev_id,
	148	const char *name)
	149	{
	150	return ERR_PTR(-ENOENT);
	151	}
766e6a4e GL	152	#endif
766e6a4e GL	153
409dc360 RK	154	/*
	155	* Find the correct struct clk for the device and connection ID.
	156	* We do slightly fuzzy matching here:
	157	* An entry with a NULL ID is assumed to be a wildcard.
	158	* If an entry has a device ID, it must match
	159	* If an entry has a connection ID, it must match
	160	* Then we take the most specific entry - with the following
659431fc	161	* order of precedence: dev+con > dev only > con only.
409dc360	162	*/
e8bf8df9	163	static struct clk_lookup clk_find(const char dev_id, const char *con_id)
0318e693	164	{
e8bf8df9	165	struct clk_lookup p, cl = NULL;
67b50871	166	int match, best_found = 0, best_possible = 0;
	167
	168	if (dev_id)
	169	best_possible += 2;
	170	if (con_id)
	171	best_possible += 1;
0318e693 RK	172
0318e693 RK	173	list_for_each_entry(p, &clocks, node) {
0318e693	174	match = 0;
409dc360 RK	175	if (p->dev_id) {
	176	if (!dev_id \|\| strcmp(p->dev_id, dev_id))
	177	continue;
	178	match += 2;
	179	}
	180	if (p->con_id) {
	181	if (!con_id \|\| strcmp(p->con_id, con_id))
	182	continue;
	183	match += 1;
	184	}
0318e693	185
67b50871	186	if (match > best_found) {
e8bf8df9	187	cl = p;
67b50871	188	if (match != best_possible)
67b50871	189	best_found = match;
e4bf5bec	190	else
e4bf5bec	191	break;
0318e693 RK	192	}
0318e693 RK	193	}
e8bf8df9	194	return cl;
0318e693 RK	195	}
0318e693 RK	196
05fd8e73	197	struct clk clk_get_sys(const char dev_id, const char *con_id)
0318e693	198	{
e8bf8df9	199	struct clk_lookup *cl;
035a61c3	200	struct clk *clk = NULL;
0318e693 RK	201
0318e693 RK	202	mutex_lock(&clocks_mutex);
035a61c3	203
e8bf8df9	204	cl = clk_find(dev_id, con_id);
035a61c3 TV	205	if (!cl)
	206	goto out;
	207
73e0e496 SB	208	clk = __clk_create_clk(__clk_get_hw(cl->clk), dev_id, con_id);
	209	if (IS_ERR(clk))
	210	goto out;
	211
	212	if (!__clk_get(clk)) {
	213	__clk_free_clk(clk);
e8bf8df9	214	cl = NULL;
035a61c3 TV	215	goto out;
	216	}
	217
035a61c3	218	out:
0318e693 RK	219	mutex_unlock(&clocks_mutex);
0318e693 RK	220
035a61c3	221	return cl ? clk : ERR_PTR(-ENOENT);
0318e693	222	}
05fd8e73 SH	223	EXPORT_SYMBOL(clk_get_sys);
	224
	225	struct clk clk_get(struct device dev, const char *con_id)
	226	{
	227	const char *dev_id = dev ? dev_name(dev) : NULL;
766e6a4e GL	228	struct clk *clk;
	229
	230	if (dev) {
035a61c3 TV	231	clk = __of_clk_get_by_name(dev->of_node, dev_id, con_id);
035a61c3 TV	232	if (!IS_ERR(clk) \|\| PTR_ERR(clk) == -EPROBE_DEFER)
a34cd466	233	return clk;
766e6a4e	234	}
05fd8e73 SH	235
	236	return clk_get_sys(dev_id, con_id);
	237	}
0318e693 RK	238	EXPORT_SYMBOL(clk_get);
	239
	240	void clk_put(struct clk *clk)
	241	{
	242	__clk_put(clk);
	243	}
	244	EXPORT_SYMBOL(clk_put);
	245
	246	void clkdev_add(struct clk_lookup *cl)
	247	{
	248	mutex_lock(&clocks_mutex);
	249	list_add_tail(&cl->node, &clocks);
	250	mutex_unlock(&clocks_mutex);
	251	}
	252	EXPORT_SYMBOL(clkdev_add);
	253
0a0300dc RK	254	void __init clkdev_add_table(struct clk_lookup *cl, size_t num)
	255	{
	256	mutex_lock(&clocks_mutex);
	257	while (num--) {
	258	list_add_tail(&cl->node, &clocks);
	259	cl++;
	260	}
	261	mutex_unlock(&clocks_mutex);
	262	}
	263
0318e693 RK	264	#define MAX_DEV_ID 20
	265	#define MAX_CON_ID 16
	266
	267	struct clk_lookup_alloc {
	268	struct clk_lookup cl;
	269	char dev_id[MAX_DEV_ID];
	270	char con_id[MAX_CON_ID];
	271	};
	272
e9d7f406 RK	273	static struct clk_lookup * __init_refok
	274	vclkdev_alloc(struct clk clk, const char con_id, const char *dev_fmt,
	275	va_list ap)
0318e693 RK	276	{
	277	struct clk_lookup_alloc *cla;
	278
6d803ba7	279	cla = __clkdev_alloc(sizeof(*cla));
0318e693 RK	280	if (!cla)
	281	return NULL;
	282
	283	cla->cl.clk = clk;
	284	if (con_id) {
	285	strlcpy(cla->con_id, con_id, sizeof(cla->con_id));
	286	cla->cl.con_id = cla->con_id;
	287	}
	288
	289	if (dev_fmt) {
0318e693 RK	290	vscnprintf(cla->dev_id, sizeof(cla->dev_id), dev_fmt, ap);
0318e693 RK	291	cla->cl.dev_id = cla->dev_id;
0318e693 RK	292	}
	293
	294	return &cla->cl;
	295	}
e9d7f406 RK	296
	297	struct clk_lookup * __init_refok
	298	clkdev_alloc(struct clk clk, const char con_id, const char *dev_fmt, ...)
	299	{
	300	struct clk_lookup *cl;
	301	va_list ap;
	302
	303	va_start(ap, dev_fmt);
	304	cl = vclkdev_alloc(clk, con_id, dev_fmt, ap);
	305	va_end(ap);
	306
	307	return cl;
	308	}
0318e693 RK	309	EXPORT_SYMBOL(clkdev_alloc);
0318e693 RK	310
c0683039 TL	311	int clk_add_alias(const char alias, const char alias_dev_name, char *id,
	312	struct device *dev)
	313	{
	314	struct clk *r = clk_get(dev, id);
	315	struct clk_lookup *l;
	316
	317	if (IS_ERR(r))
	318	return PTR_ERR(r);
	319
	320	l = clkdev_alloc(r, alias, alias_dev_name);
	321	clk_put(r);
	322	if (!l)
	323	return -ENODEV;
	324	clkdev_add(l);
	325	return 0;
	326	}
	327	EXPORT_SYMBOL(clk_add_alias);
	328
0318e693 RK	329	/*
	330	* clkdev_drop - remove a clock dynamically allocated
	331	*/
	332	void clkdev_drop(struct clk_lookup *cl)
	333	{
	334	mutex_lock(&clocks_mutex);
	335	list_del(&cl->node);
	336	mutex_unlock(&clocks_mutex);
	337	kfree(cl);
	338	}
	339	EXPORT_SYMBOL(clkdev_drop);
e9d7f406 RK	340
	341	/**
	342	* clk_register_clkdev - register one clock lookup for a struct clk
	343	* @clk: struct clk to associate with all clk_lookups
	344	* @con_id: connection ID string on device
	345	* @dev_id: format string describing device name
	346	*
	347	* con_id or dev_id may be NULL as a wildcard, just as in the rest of
	348	* clkdev.
	349	*
	350	* To make things easier for mass registration, we detect error clks
	351	* from a previous clk_register() call, and return the error code for
	352	* those. This is to permit this function to be called immediately
	353	* after clk_register().
	354	*/
	355	int clk_register_clkdev(struct clk clk, const char con_id,
	356	const char *dev_fmt, ...)
	357	{
	358	struct clk_lookup *cl;
	359	va_list ap;
	360
	361	if (IS_ERR(clk))
	362	return PTR_ERR(clk);
	363
	364	va_start(ap, dev_fmt);
	365	cl = vclkdev_alloc(clk, con_id, dev_fmt, ap);
	366	va_end(ap);
	367
	368	if (!cl)
	369	return -ENOMEM;
	370
	371	clkdev_add(cl);
	372
	373	return 0;
	374	}
a251361a	375	EXPORT_SYMBOL(clk_register_clkdev);
e9d7f406 RK	376
	377	/**
	378	* clk_register_clkdevs - register a set of clk_lookup for a struct clk
	379	* @clk: struct clk to associate with all clk_lookups
	380	* @cl: array of clk_lookup structures with con_id and dev_id pre-initialized
	381	* @num: number of clk_lookup structures to register
	382	*
	383	* To make things easier for mass registration, we detect error clks
	384	* from a previous clk_register() call, and return the error code for
	385	* those. This is to permit this function to be called immediately
	386	* after clk_register().
	387	*/
	388	int clk_register_clkdevs(struct clk clk, struct clk_lookup cl, size_t num)
	389	{
	390	unsigned i;
	391
	392	if (IS_ERR(clk))
	393	return PTR_ERR(clk);
	394
	395	for (i = 0; i < num; i++, cl++) {
	396	cl->clk = clk;
	397	clkdev_add(cl);
	398	}
	399
	400	return 0;
	401	}
	402	EXPORT_SYMBOL(clk_register_clkdevs);